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Quality ARRL logo merchandise for hams!
Learn the strengths and limitations of the battery, different battery types and what conditions are best for a battery.
The new USB Boe-Bot is a reprogrammable robot built on a high-quality brushed aluminum chassis.
A DIY guide to designing and building transistor radios. Includes complete projects and detailed schematics.
The quick, easy way to leap into the fascinating world of physical computing!
Contact Sport: A Story of Champions, Airwaves, and a One-Day Race around the World.
A story of the quartz crystal—a technology that changed the tide of World War II. New Paperback Edition!
An essential guide for anyone wishing to understand digital communication systems through simulations using SystemVue.
Part of the Amateur Radio adventure series by popular author Cynthia Wall, KA7ITT. A sailing trip turns into a fight to save a little boy's life.
A clear, step-by-step approach to practical uses of discrete-signal analysis and design, especially for communications and radio engineers.
This book traces the life of Don Wallace and with it the early history of Amateur Radio.
Easy-to-implement methods that calculate mathematically correct numerical values for various transmission line problems.
Part of the Amateur Radio adventure series by popular author Cynthia Wall, KA7ITT.
A remarkable story of Edgar Harrison and the extraordinary adventures he encountered throughout World War II.
The most comprehensive book on electromagnetic compatibility, including all the latest advances and developments in the field.
Special Event Stations, DXCC Program, QSL Service, Operating Specialties, W100AW & W1AW QSLs via Bureau, Amateur Code, Contests, Operating Resources, Awards, International Operating, Logbook of the World, Centennial QSO Party, NPOTA, W1AW
FCC License Info and Forms, Volunteer Instructors/Mentors, Courses & Training, Getting Licensed, Volunteer Examiners, Amateur Radio in the Classroom, What is Ham Radio, License Certificates, Get on the Air, College Students and Educators
Member Directory, myARRL, Membership Certificate, Member Discounts, Blind Membership, Member Support, Dues Increase FAQ, Join ARRL/Renew Membership, Membership Levels
State and Local, Technical Relations Office, Volunteer Consulting Engineer Program, Volunteer Counsel Program, Antenna Regulation and Zoning, CCR Study Information, International, Federal RFI Preemption, Federal
NTS Manual, Ham Aid, Public Service Resources, ARES, NTS, Public Service Honor Roll, Served Agencies and Partners
ARRL References, Radio Technology Topics, ARRL Lab, Radio Frequency Interference (RFI), Tech Portal
Volunteer Opportunities, Youth, The ARRL Foundation, Hamfests and Conventions Calendar, Donate to ARRL, Recruiting & Outreach, Clubs
ARRL Publication Dealers, ARRL Store, List all Products, Periodicals, Return Policy, Customer Service/Support, Shipping, Product Notes
ARRL, the national association for Amateur Radio
225 Main Street
Newington, CT, 06111-1494 USA